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BULK AND SURFACE ELECTRONIC STATES OF ORDEREDCu3Au(001): AN ANGLE-RESOLVED PHOTOEMISSION INVESTIGATION

Author

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  • S. LÖBUS

    (Laboratorium für Festkörperphysik, Universität Duisburg, D-47048 Duisburg, Germany)

  • R. COURTHS

    (Laboratorium für Festkörperphysik, Universität Duisburg, D-47048 Duisburg, Germany)

  • S. HALILOV

    (Theoretische Festkörperphysik, Universität Duisburg, D-47048 Duisburg, Germany)

  • H. GOLLISCH

    (Theoretische Festkörperphysik, Universität Duisburg, D-47048 Duisburg, Germany)

  • R. FEDER

    (Theoretische Festkörperphysik, Universität Duisburg, D-47048 Duisburg, Germany)

Abstract

We have performed an angle-resolved ultraviolet photoemission spectroscopy (ARUPS) investigation of orderedCu3Au(001)at room temperature using He resonance and synchrotron radiation. The positions of upperCu-like bulk bands near the center Γ of the bulk Brillouin zone (BZ) and the dispersion of the upper sp band along the A line have been determined using bulk-sensitive photon energies10 eV≤hν≥15 eV. Except for a downward shift, the calculated bulk bands are in excellent agreement with experiment. Around the centers$\overline \Gamma$of the surface BZ, we have identified three new surface states in the energy region of the Au-like states and several surface-sensitive features in theCu-like region below the known surface state on top of the Cu-like bulk d bands. These states strongly contribute to the ARUPS spectra forhν≥20 eV. The wealth of surface features found is in overall agreement with a recent surface electronic structure calculation [S. Halilov, H. Gollisch, E. Tamura and R. Feder,J. Phys.: Condens. Matter5, 4711 (1993)]. More detailed information is obtained by comparing the experimental spectra with theoretical ones calculated by a relativistic one-step model formalism.

Suggested Citation

  • S. Löbus & R. Courths & S. Halilov & H. Gollisch & R. Feder, 1996. "BULK AND SURFACE ELECTRONIC STATES OF ORDEREDCu3Au(001): AN ANGLE-RESOLVED PHOTOEMISSION INVESTIGATION," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 3(05n06), pages 1749-1761.
    • Handle: RePEc:wsi:srlxxx:v:03:y:1996:i:05n06:n:s0218625x96002680
    DOI: 10.1142/S0218625X96002680
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    Keywords

    ; 71.20.Cf; 73.20.At; 79.60.-i;
    All these keywords.

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